ctools_plugin_api_info() should provide $owner and $hook to {api-hook}_alter

In the current implementation the API hook is called like hook_ctools_plugin_api($owner, $hook), but the alter hook does not provide that additional information (hook_ctools_plugin_api_alter(&$info)), so it is impossible to distinguish different owners or hooks in the alter implementation, although this was possible in the definition hook. This way you cannot alter any module's implementation, that implements multiple CTools based APIs.

I'll post a patch in the next comment.